Sun Kai, Gao Dazhi, Zhao Xiaojing, Guo Doudou, Song Wenhua, Li Yuzheng
Department of Marine Technology, Ocean University of China, Qingdao 266100, China.
Department of Physics and Optoelectronic Engineering, Ocean University of China, Qingdao 266100, China.
Sensors (Basel). 2023 Aug 3;23(15):6881. doi: 10.3390/s23156881.
In the shallow-water waveguide environment, the tonal signals radiated by moving targets carry modal interference and Doppler shift information. The modal interference can be used to obtain the time of the closest point of approach (tCPA) and the ratio of the range at the closest point of approach to the velocity of the source (rCPA/v). However, parameters rCPA and cannot be solved separately. When tCPA is known, the rCPA and the of the target can be obtained theoretically by using the Doppler information. However, when the Doppler frequency shift is small or at a low signal-to-noise ratio, there will be a strong parametric coupling between rCPA and . In order to solve the above parameter coupling problem, a target motion parameter estimation method from tonal signals with a single hydrophone is proposed in this paper. The method uses the Doppler and modal interference information carried by the tonal signals to obtain two different parametric coupling curves. Then, the parametric coupling curves can be used to estimate the two motion parameters. Simulation experiments verified the rationality of this method. The proposed method was applied to the SWellEx-96 and speedboat experiments, and the estimation errors of the motion parameters were within 10%, which shows the method is effective in its practical applications.
在浅水波导环境中，运动目标辐射的音调信号携带模态干涉和多普勒频移信息。模态干涉可用于获取最近会遇点时间（tCPA）以及最近会遇点距离与源速度之比（rCPA/v）。然而，rCPA和 参数无法单独求解。当tCPA已知时，理论上可利用多普勒信息获取目标的rCPA和 。然而，当多普勒频移较小或信噪比很低时，rCPA和 之间会存在很强的参数耦合。为解决上述参数耦合问题，本文提出一种基于单个水听器音调信号的目标运动参数估计方法。该方法利用音调信号携带的多普勒和模态干涉信息获取两条不同的参数耦合曲线。然后，利用这些参数耦合曲线估计两个运动参数。仿真实验验证了该方法的合理性。将该方法应用于SWellEx - 96和快艇实验，运动参数估计误差在10%以内，表明该方法在实际应用中是有效的。
